Research the method of missile tracking flight in end-game

In this paper, in order to meet the requirement of track target in missile endgame, input-output approximate linearization of a nonlinear missile has been studied. A method for controlling the nonlinear system that is input-output linearization is produced with no internal or zero dynamics. Desired tracking performance for lateral acceleration of the missile is achieved by using a nonlinear control law that has been derived by selecting the lateral velocity as the linearization output. Then an adaptive nonlinear controller is designed that guarantees tracking performance when the uncertain parameters vary within a stability bound-An autopilot combining an indirect adaptive controller with approximate feedback linearization is proposed in order to achieve asymptotic tracking. Computer simulations show that this approach offers a possible autopilot design for nonlinear missiles with uncertain parameters.